More
)
To show all the databases created in the database management system.
Syntax -
Mon -
Sun 8.00 AM - 8.00 PM
show databases;
To create a database in which all related data will be stored.
Syntax -
create database database_name ;
To delete a database for many created databases.
Syntax -
drop database database_name ;
To check the current database in which we are currently working.
Syntax -
select database();
To use a database in which we need to create table or modify the table.
Syntax -
use database_name ;
Null means when we do not enter any value in any column then in this place of value it shows NULL.
It does not need any tag (it entered by default).
AND
NOT NULL means when we do not enter any value in any column then there automatically inserted zero.
Syntax -
create table table_name (
column1_name data_type(range) not null ,
column2_name data_type(range) ,
.......
);
The default value means when we do not enter any value in any column then there we can use a custom default value.
Syntax -
create table table_name (
column1_name data_type(range) default'type default value what to show' ,
column_name data_type(range) ,
....
);
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